co.cask.cdap.data.runtime.main.ResourcesClassLoaderTest.java Source code

Introduction

Here is the source code for co.cask.cdap.data.runtime.main.ResourcesClassLoaderTest.java

Source

/*
 * Copyright  2015 Cask Data, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package co.cask.cdap.data.runtime.main;

import co.cask.cdap.common.lang.ClassLoaders;
import org.apache.hadoop.mapred.JobConf;
import org.junit.Assert;
import org.junit.Test;

import java.net.URI;
import java.net.URL;

/**
 *
 */
public class ResourcesClassLoaderTest {

    @SuppressWarnings("AccessStaticViaInstance")
    @Test
    public void testCustomResourceLoading() throws Exception {
        // Using default classloader
        JobConf jobConf = new JobConf();
        // foo-loader is not defined in default classloader
        Assert.assertNull(jobConf.get("foo-loader"));
        // On first load, TestClass.init should be false
        Assert.assertFalse(TestClass.init);
        TestClass.init = true;

        // Using ResourcesClassLoader with URL /test-conf
        URL url = getClass().getResource("/test-conf/mapred-site.xml");
        ClassLoader previousClassLoader = ClassLoaders.setContextClassLoader(
                new ResourcesClassLoader(new URL[] { getParentUrl(url) }, getClass().getClassLoader()));
        jobConf = new JobConf();
        Assert.assertEquals("bar-loader", jobConf.get("foo-loader"));
        // TestClass is already initialzed earlier, hence TestClass.init should be true
        TestClass testClass = (TestClass) Thread.currentThread().getContextClassLoader()
                .loadClass(TestClass.class.getName()).newInstance();
        Assert.assertTrue(testClass.init);
        ClassLoaders.setContextClassLoader(previousClassLoader);

        // Using ResourcesClassLoader with URL /test-app-conf
        url = getClass().getResource("/test-app-conf/mapred-site.xml");
        previousClassLoader = ClassLoaders.setContextClassLoader(
                new ResourcesClassLoader(new URL[] { getParentUrl(url) }, getClass().getClassLoader()));
        jobConf = new JobConf();
        Assert.assertEquals("baz-app-loader", jobConf.get("foo-loader"));
        // TestClass is already initialzed earlier, hence TestClass.init should be true
        testClass = (TestClass) Thread.currentThread().getContextClassLoader().loadClass(TestClass.class.getName())
                .newInstance();
        Assert.assertTrue(testClass.init);
        ClassLoaders.setContextClassLoader(previousClassLoader);
    }

    @SuppressWarnings("ConstantConditions")
    @Test
    public void testFirstNonNull() throws Exception {
        Integer null1 = null;
        Integer five = 5;

        Assert.assertNull(ResourcesClassLoader.firstNonNull(null1, null1));
        Assert.assertEquals((Integer) 5, ResourcesClassLoader.firstNonNull(null1, five));
        Assert.assertEquals((Integer) 5, ResourcesClassLoader.firstNonNull(five, null1));
        Assert.assertEquals((Integer) 5, ResourcesClassLoader.firstNonNull(five, five));
    }

    private URL getParentUrl(URL url) throws Exception {
        URI uri = url.toURI();
        return uri.getPath().endsWith("/") ? uri.resolve("..").toURL() : uri.resolve(".").toURL();
    }

    public static final class TestClass {
        public static boolean init = false;
    }
}